Blast resistant design and limits of the response of a structure to an external explosion D. Makovička 1 & D. Makovička Jr 2 1 Czech Technical University in Prague, Klokner Institute, Czech Republic 2 Static and Dynamic Consulting, Czech Republic Abstract A 3-D dynamic analysis of an entire structure is used to determine the effects of an explosion and the response of a structure. Damage to the structure is assessed accordingly, firstly by the angle of rotation of the middle axis/surface, and secondly by the limit internal forces of the selected structure. The extreme nature of blast resistance makes it necessary to accept that structural members have some degree of inelastic response in most cases. This enables the application of structure dissipation using the ductility factor. The limits are correlated with qualitative damage expectations. The methodology for dynamic response assessment and its application to the new RC building is discussed. Keywords: explosion, dynamic analysis, structure response, failure assessment. 1 Introduction When a blasting charge explodes in an open area, the action of the pressure of the shock wave on an obstruction depends on how the structure is situated with respect to the focus of the explosion, on the path from the explosion to the structure, on the characteristics of the loaded structure, and on the shock wave parameters on contact with the building. During an actual event, the specific course of action of the load depends on the whirl bypass of the surface of the structure, on the atmospheric pressure, on the temperature conditions and other factors which are usually neglected for a simplified analysis. The parameters of the explosive are also determined on the basis of mean values; the formulas that are used are empiric and operate with mean (probable) factor values. Thus the calculations of structures for shock wave effects are significantly influenced by these inaccuracies in the input quantities of the whole phenomenon. Structures Under Shock and Impact XII 229 www.witpress.com, ISSN 1743-3509 (on-line) WIT Transactions on The Built Environment, Vol 126, © 201 WIT Press 2 doi:10.2495/SU120201
Blast resistant design and limits of the response of a structure to an external explosion
Jun 26, 2023
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